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1、精选优质文档-倾情为你奉上1. Metals are elements that generally have good electrical and thermal conductivity. Many metals have high strength, high stiffness, and have good ductility.2. Plastic deformation is the ability of bend or deform before breaking. As engineers, we usually design materials so that they do
2、nt deform under normal conditions.3. The lathe bed is the main frame, involving a horizontal beam on two vertical supports. It is usually made of grey or nodular cast iron to damp vibrations and is made by casting. 4. Although small tolerances give higher quality work and a better operating mechanis
3、m, the cost of manufacture increases rapidly as the tolerances are reduced. It is therefore important that the tolerances be specified at the largest values that the operating or functional considerations permit.5. A tensile test consists of slowly pulling a sample of material with a tensile load un
4、til it breaks. The ends of tensile specimens are usually enlarged to provide extra area for grip-ping and to avoid having the sample break where it is being gripped.6. As we look around us we see a world full of “things”, machines, devices, tools, things that we have designed, built, and used; thing
5、s made of wood, metals, ceramics, and plastics. We know from experience that some things are better than others; they last longer, cost less, are quieter, or are ease to use.7. Interchangeability means that identical parts must be interchangeable, i.e., able to replace each other, whether during ass
6、embly or subsequent maintenance work; without the need for any fitting operations.8. The term operation is defined as when one oprator(or a group of operators) works in a definite position (one machine tool or clipping table) to achieve the continuous man.9. A gear can be gripped axially between a s
7、houlder on the shaft and a spacer, with torque being transmitted through a key. 10. A common important feature of rapid prototyping and manufacturing is that the prototype part is produced by assigning materials rather than removing materials.11. 当用电火花机床加工工件时，去除的材料是电极与工件间放电产生的蚀除物。工作介质是非导电液体，它能清洗掉电腐蚀材料，同时也作为冷却液。12. 用于生产中的图样，应当只包括能够对物体形状清楚、完整描述的视图。最低限度所需要的视图称为必需的视图。在选择视图时，绘图者应该选择能够最佳表示物体基本轮廓和形状，而且图中的隐藏线（虚线）要最少的视图。专心-专注-专业